Chaeles s



(No Model.)

0. S. LEWIS.

PENDULUM.

No. 290,186. Patented Dec. 11,1883;

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UNZTED STATES PATENT: (lemon.

CHARLES S. LEXVIS, OF XVATERBURY, COXNEOTICUT, ASSIGNOR TO THE \VATERBURY CLOCK COMPANY, OF SAME PLACE.

PENDULUM.

SPECIFICATION forming part of Letters Patent No. 290,186, dated December 11, 1883.

Application filed June 26, 1883. (No model.)

To aZZ 2072,0722, it may concern Be it known that I, CHARLES S. Lnwls, of \Vaterbury, in the county of New Haven and State of Connecticut, have invented a certain new and useful Improvement in Means for Indicating Adjustments of Pendulums, of which the following is a specification.

The object of this improvement is to produce a simple means for indicating the extent to which a clock-pendulum is adjusted.

In the accompanying drawings, Figure l is a front view of a pendulum embodying my improvement. Fig. 2 is a back view of the pendulum with the rod broken off and the back part of the case and the weight of the bob removed, and Fig. 3 is atransverse vertical section of the pendulum.

Similar letters of reference designate corresponding parts in all the figures.

A designates the rod of the pendulum. It may be made of brass or other suitable material, and, as shown, is of an ellipsoidal crosssection. The bob B of the pendulum has a case which, preferably, will be made of ornamental sheet metal. It is shown as made of two parts, a a, which are of circular form. Both parts may be ornamented with beads, other ornamental figures, or embossing. The front part, a, has a dial, G, delineated upon or afiixed to it, and, as here shown, it has a central portion surrounded by a bead, s, on which the dial may be delineated or mounted. The front part, a, as at the back a deep rim, a and the backpart is fitted into this rim. Preferably the back part has a rim, (6, which fits snugly within the rim a of the front part. The parts are held together merely by friction. The red A passes through aslot, a, in the rim a of the front part, and the rim a of the back part is provided with a notch, a to accommodate the rod. The lower portion of the rodA is externally screw-threaded and has fitted to it a nut, O. In the exterior of this nut is a circular groove, I), which engages with the edges of notches a a in the rims of the parts a a. lVhen the nut is turned, it rises or descends along the rod, and, owing to its engagement with the parts a a of the bob-case, the bob moves with it. This is a simple way of constructing a bob and providing for its adjust ment. In the case of the bob is an annular weight, 0, which may be made of lead or other suitably-heavy material, and is provided with recesses c c to accommodate the red A. To the upper end of the nut O is secured a toothed pinion, D, which is contained within the case of the bob. It is turned when the nut is turned.

E designates a toothed wheel which is arranged within the case of the bob. The pinion D engages with the wheel, and when turned imparts motion to it. This wheel is rigidly mounted on a shaft or arbor, d, that is supported in the front part, a, of the case.

An index finger, H, is rigidly secured at the front end of the shaft or arbor (Z. When the nut O is turned, the bob is raised or lowered, and the wheel E is rotated so as to cause the index-finger to travel around the dial and in dicate the extent to which the bob has been moved. This will render it easyto adjust the bob to a nicety.

It will be observed that the weight is at one side of the pendulum-rod, and the dial and the toothed wheel E are at the other side of the rod within the case a a.

The manner of securing the parts of the bob-case together by friction renders the bob simple and cheap, and enables the case to be readily taken apart to afford access to the devices inclosed in the case.

Above the bob an ornament, I, made of sheet metal is arranged. It is slipped on the rod A and rests on the upper part of the bob. It is surmounted by bars J connected by crosspieees or bars K, which are slipped on the rod.

XVhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with a screw-threaded p'emlulum-rod, of a bob fitting on said rod and having an inclosing-case, a non-rotary dial, a nut fitting said rod, a shaft supported by the front of the ease and concentric with the dial, an index-finger mounted on said shaft and moved thereby over the dial, a gear-wheel also mounted on the shaft, and a pinion con- 9 nected with the nut and engaging with the gear-wheel, substantially as specified.

2. The combination, with a screw-threaded pendulum-rod and a bob adapted to be adjusted along the same and having a case made of two parts, of a nut applied to the rod for the opposite side of the rod, a. dial on the ex- IO adjusting thebob, and havingacircular groove terior of the case, and a pinion secured to the with which the two parts of the case engage, nut and engaging with said gear-wheel, subsubstantially as specified. stantially as specified.

3. The combination of a screw-threaded pendulum-rod, a nut fitting thereon, abob fit- CHARLES LEWIS ting the rod and comprising an inclosing-case \Vitnesses: and aweight arranged in the case 011 one side FREDK. HAYNES, of said rod, an index-finger and gear-wheel on I T. J. KEANE. 

